Unnamed (East Fork of Glen Creek) (ARDF #MM077) Ag, Au

Unnamed (East Fork of Glen Creek)

Prospect, Inactive

Commodities and mineralogy

Main commodities	Ag; Au
Other commodities	As; Pb
Ore minerals	arsenopyrite; galena
Gangue minerals	quartz

Geographic location

Quadrangle map, 1:250,000-scale	MM
Quadrangle map, 1:63,360-scale	C-2
Latitude	63.5616
Longitude	-150.7346
Nearby scientific data	Find additional scientific data near this location
Location and accuracy	This prospect is at an elevation of about 2900 feet in the East Fork of Glen Creek, about 0.85 mile upstream of its confluence with the West Fork of Glen Creek. The location is probably accurate within 500 feet. The prospect corresponds to number 53 of Bundtzen, Smith, and Tosdal (1976), 255 of Hawley and Associates (1978), 58 of Bundtzen (1981), and 81 of Thornsberry, McKee, and Salisbury (1984).

Geologic setting

Geologic description The country rocks in the area of this prospect consist of marble and chloritic phyllite of the lower Paleozoic Spruce Creek sequence. A few hundred feet south of the prospect, Spruce Creek rocks are juxtaposed against Birch Creek Schist by a fault that strikes ENE. Tertiary mafic dikes appear to be emplaced along this fault (Bundtzen, 1981; Thornsberry, McKee, and Salisbury, 1984, fig. K-2). The deposit consists of a quartz vein that contains arsenopyrite and galena. An adit, now caved, explored the vein in about 1912. No assays are available, but the exploration suggests that the vein was prospected for silver or gold (Bundtzen, Smith, and Tosdal, 1976; Bundtzen, 1981).
Geologic map unit	(-150.736882318696, 63.5610985269483)
Mineral deposit model	Low-sulfide gold-quartz vein or polymetallic vein (Cox and Singer, 1986; models 36a or 22c).
Mineral deposit model number	36a or 22c
Age of mineralization	The deposit is assumed to be Eocene (see record MM091).

Production and reserves

Workings or exploration	The vein was explored by an adit in about 1912 (Bundtzen, 1981).
Indication of production	Undetermined
Additional comments The prospect is in Denali National Park and Preserve.

References

References Bundtzen, T.K., 1981, Geology and mineral deposits of the Kantishna Hills, Mt. McKinley quadrangle, Alaska: M. S. Thesis, University of Alaska, College, Alaska, 238 p. Bundtzen, T.K., Smith, T.E., and Tosdal, R.M., 1976, Progress report--Geology and mineral deposits of the Kantishna Hills: Alaska Division of Geological and Geophysical Surveys Open-File Report AOF-98, 80 p., 2 sheets, scale 1:63,360. Cox, D.P., and Singer, D.A., eds., 1986, Mineral deposit models: U.S. Geological Survey Bulletin 1693, 379 p. Hawley, C. C. and Associates, Inc, 1978, Mineral appraisal of lands adjacent to Mt. McKinley National Park, Alaska: U. S. Bureau of Mines Open-File Report 24-78, 275 p. (paged by sections). Thornsberry, V. V., McKee, C. J., and Salisbury, W. G., eds, 1984, 1983 Mineral Resource Studies: Kantishna Hills and Dunkle Mine Areas, Denali National Park and Preserve, Alaska: U. S. Bureau of Mines Open-File Report 129-84. 3 Volumes: v. 1, Text; v. 2, Appendices; v. 3, Maps. Prepared by Salisbury & Dietz, Inc., Spokane, WA.
Reporters	C.C. Hawley
Last report date	5/3/2001